Scroll Fire     

“Scroll Fire” is a feature that enables a method to be called (once and only once) when user scrolls current page and the DOM element (or component) that it is applied to comes into the viewport.

For ease of use, its implementation is through a Vue Directive called v-scroll-fire.

NOTE
There is also a v-scroll directive which fires whenever user scrolls the page, available to read here..

<!-- Template for VueModel below -->
....
<div v-scroll-fire="bounceImage">...</div>
// VueModel for template above
{
  ...,
  methods: {
    bounceImage (element) {
      // in this example, when the `<div>` comes into view,
      // we bounce it for 2 seconds

      // we add helper `nimate-bounce` Quasar CSS class
      element.classList.add('animate-bounce')
      setTimeout(() => {
        // we make sure the node is still in DOM
        // (user hasn't navigated away from the Vue component
        // rendering our `<div>`)
        // so we don't generate an error
        if (document.body.contains(element)) {
          // then remove the helper class to
          // stop bouncing
          element.classList.remove('animate-bounce')
        }
      }, 2000)
    }
  }
}

IMPORTANT
For performance purposes, the scroll listener function injected is by default debounced by 50ms. Read more about debouncing here.

Determining Scrolling Container

Please read here about how Quasar determines the container to attach scrolling events to.

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Last updated: Tue Feb 20 2018
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